HIBERNATE - Features of Hibernate

Transparent persistence without byte code processing
  Transparent persistence
  JavaBeans style properties are persisted
  No build-time source or byte code generation / processing
  Support for extensive subset of Java collections API
  Collection instance management
  Extensible type system
  Constraint transparency
  Automatic Dirty Checking
  Detached object support
  Object-oriented query language
  Powerful object-oriented query language
  Full support for polymorphic queries
  New Criteria queries
  Native SQL queries
  Object / Relational mappings
  Three different O/R mapping strategies
  Multiple-objects to single-row mapping
  Polymorphic associations
  Bidirectional associations
  Association filtering
  Collections of basic types
  Indexed collections
  Composite Collection Elements
  Lifecycle objects
  Automatic primary key generation
  Multiple synthetic key generation strategies
  Support for application assigned identifiers
  Support for composite keys
  Object/Relational mapping definition
  XML mapping documents
  Human-readable format
  XDoclet support
  HDLCA (Hibernate Dual-Layer Cache Architecture)
  Thread safeness
  Non-blocking data access
  Session level cache
  Optional second-level cache
  Optional query cache
  Works well with others
  High performance
  Lazy initialization
  Outer join fetching
  Batch fetching
  Support for optimistic locking with versioning/timestamping
  Highly scalable architecture
  High performance
  No "special" database tables
  SQL generated at system initialization time
  (Optional) Internal connection pooling and PreparedStatement caching
  J2EE integration
  JMX support
  Integration with J2EE architecture (optional)
  New JCA support